382 
SELACHII. 
Oxyrhina crassidens, Dixon. 
1843. Oxyrhina mantelli, L. Agassiz (errore), Poiss. Foss. vol. iii. 
pi. xxxiii. fig. 6. 
1850. Oxyrhina crassidens, F. Dixon, Foss. Sussex, p. 367, pi. xxxi. 
fig. 13. 
Type. Detached tooth ; British Museum. 
Teeth extremely robust and of very large size, sometimes attaining 
a total height of 0'06. Main portion of the crown narrow with 
respect to the root, the coronal edges rapidly diverging outwards at 
the base and usually coarsely crimped ; outer coronal face irregularly 
convex, with few vertical wrinkles; inner face extremely convex 
and smooth, or with minute basal wrinkles. 
Form. Sf Loc. Senonian : Sussex. 
25823. Type specimen ; Houghton. Dixon Coll. 
25786. Two nearly complete anterior teeth and four dental crowns. 
Dixon Coll. 
25787. Very small dental crown. Dixon Coll. 
4577. Dental crown, figured by Agassiz, loc. cit. ; Lewes. 
Mantell Coll. 
4G951. Dental crown ; Lewes. Capron Coll. 
49951 a. Base of tooth ; Arundel. Capron Coll. 
Oxyrhina triangularis, Egerton. 
1845. Oxyrhina triangularis , Sir P. Egerton, Quart. Journ. Geol. Soc. 
vol. i. p. 169, woodcut. 
Type. Imperfect teeth ; British Museum. 
A very small species, founded upon the much compressed broad 
teeth mentioned below, Cui*^*^!** Cl<uik 
Form. Sf Loc. Upper Cretaceous : Pondicherry, Madras, India. 
P. 594. Two dental crowns, -one figured cU r Egerton Coll . 
Oxyrhina desorii, Agassiz; 
1843. Oxyrhina desorii, L. Agassiz, Poiss. Foss. vol. iii. p. 282, 
pi. xxxvii. figs. 8-13. 
1843. Oxyrhina leptodon, L. Agassiz, tom. cit. p. 282, pi. xxxvii. figs. 3-5 
(P pi. xxxiv. figs. 1, 2). 
1847. Oxyrhina desorii, R. W. Gibbes, Proc. Acad. Nat. Sci. Pliilad. 
p. 267. 
1849. Oxyrhina desorii , E. Sismonda, Mem. R. Accad. Sci. Torino, [2] 
vol. x. p. 44, pi. ii. figs. 7-16. 
